Description: Reverse connect protection. Measuring range: DC 0.00V--30.0V. Power Supply: DC 3.00V- 30.0V Accuracy: 1%. (when 10V, 0.3V; when 100K Max Working Current: 18mA Refresh rate: about 300mS / times. Display: 0.56 "dual 3 digital tube. Operating Temperature: -10C - 65C Specification: Material: PCB LED Color: Green Size: Approx. 48x 29x 22mm/ 1.89x 1.14x 0.87inch Open Hole: Approx. 46x 27mm/ 1.81x 1.06inch Package Includes: 1 Piece Digital Voltmeter(2 Pack) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-dadangjia